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Effective sewage sanitation with low CO2 footprint : a paper presented at the second conference on developments in faecal sludge management in Durb...

Improving global access to clean drinking water and safe sanitation is one of the least expensive and most effective means to improve public health and save lives. The overall objective of this work is to develop a self-contained and energy neutral sanitation technology that relies on anaerobic digestion of human wastes to generate biogas, and use the biogas to heat-sterilize the treated effluent. An effective heat exchanger increases the efficacy of the heat sterilization. A prototype system consisting of a custom-built floating dome digester, heater and heat exchanger was built. Daily biogas production in the digester was 0.33 m3biogas/kgCOD when feeding faeces and urine mimics. The heat-sterilization system had a thermal efficiency ranging from 50 to 70% depending on the working temperature, while the heat exchanger allowed an energy recovery of 800 kJ/day. A sterilization test was carried out using E. coli as an indicator and greater than 7 log-reduction was achieved. This new and simple system shows promise as replacement for pit latrines. [authors abstract]

TitleEffective sewage sanitation with low CO2 footprint : a paper presented at the second conference on developments in faecal sludge management in Durb...
Publication TypeConference Paper
Year of Publication2012
AuthorsColón, J, Forbis-Stokes, AA, Ouksel, LS, Deshusses, MA
Pagination7 p.; 6 fig.; 1 tab.
Date Published2012-10-29
PublisherS.n.
Place PublishedS.l.
Keywordsanaerobic digestion, faecal sludge management [FSM], pathogens, pit latrines, sanitation
Abstract

Improving global access to clean drinking water and safe sanitation is one of the least expensive and most effective means to improve public health and save lives. The overall objective of this work is to develop a self-contained and energy neutral sanitation technology that relies on anaerobic digestion of human wastes to generate biogas, and use the biogas to heat-sterilize the treated effluent. An effective heat exchanger increases the efficacy of the heat sterilization. A prototype system consisting of a custom-built floating dome digester, heater and heat exchanger was built. Daily biogas production in the digester was 0.33 m3biogas/kgCOD when feeding faeces and urine mimics. The heat-sterilization system had a thermal efficiency ranging from 50 to 70% depending on the working temperature, while the heat exchanger allowed an energy recovery of 800 kJ/day. A sterilization test was carried out using E. coli as an indicator and greater than 7 log-reduction was achieved. This new and simple system shows promise as replacement for pit latrines. [authors abstract]

NotesWith bibliography on p. 6 - 7
Custom 1342

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The copyright of the documents on this site remains with the original publishers. The documents may therefore not be redistributed commercially without the permission of the original publishers.